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lib: utils/serial: Add support for Gaisler APBUART

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This patch adds support for the UART used by the NOEL-V processor.

Cobham Gaisler's NOEL-V RISC-V processor IP is available under GPL
and commercial license and is described in more detail at
https://www.gaisler.com/noelv.

Signed-off-by: Daniel Cederman <cederman@gaisler.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Daniel Cederman
2021-04-30 08:35:56 +02:00
committed by Anup Patel
parent 632e27bb91
commit 117fb6dcb1
7 changed files with 185 additions and 0 deletions
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40
lib/utils/fdt/fdt_helper.c
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@@ -26,6 +26,8 @@
#define DEFAULT_SIFIVE_UART_REG_SHIFT 0
#define DEFAULT_SIFIVE_UART_REG_IO_WIDTH 4
#define DEFAULT_GAISLER_UART_REG_IO_WIDTH 4
#define DEFAULT_SHAKTI_UART_FREQ 50000000
#define DEFAULT_SHAKTI_UART_BAUD 115200
@@ -213,6 +215,44 @@ int fdt_parse_max_hart_id(void *fdt, u32 *max_hartid)
return 0;
}
int fdt_parse_gaisler_uart_node(void *fdt, int nodeoffset,
struct platform_uart_data *uart)
{
int len, rc;
const fdt32_t *val;
unsigned long reg_addr, reg_size;
if (nodeoffset < 0 || !uart || !fdt)
return SBI_ENODEV;
rc = fdt_get_node_addr_size(fdt, nodeoffset, &reg_addr, &reg_size);
if (rc < 0 || !reg_addr || !reg_size)
return SBI_ENODEV;
uart->addr = reg_addr;
/**
* UART address is mandatory. clock-frequency and current-speed
* may not be present. Don't return error.
*/
val = (fdt32_t *)fdt_getprop(fdt, nodeoffset, "clock-frequency", &len);
if (len > 0 && val)
uart->freq = fdt32_to_cpu(*val);
else
uart->freq = DEFAULT_UART_FREQ;
val = (fdt32_t *)fdt_getprop(fdt, nodeoffset, "current-speed", &len);
if (len > 0 && val)
uart->baud = fdt32_to_cpu(*val);
else
uart->baud = DEFAULT_UART_BAUD;
/* For Gaisler APBUART, the reg-shift and reg-io-width are fixed .*/
uart->reg_shift = DEFAULT_UART_REG_SHIFT;
uart->reg_io_width = DEFAULT_GAISLER_UART_REG_IO_WIDTH;
return 0;
}
int fdt_parse_shakti_uart_node(void *fdt, int nodeoffset,
struct platform_uart_data *uart)
{